Reportedly crooked grass (3)
I believe the answer is:
rye
'grass' is the definition.
(I know that rye is a type of cereal)
'reportedly crooked' is the wordplay.
'reportedly' shows a homophone (sound like).
'crooked' becomes 'wry' (similar in meaning).
'wry' sounds like 'RYE'.
(Other definitions for rye that I've seen before include "Hardy annual cereal grass" , "Cereal grain" , "Grass - whiskey" , "Grain crop" , "Cereal plant; whisky" .)